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Spectroscopic studies of dye-surfactant interactions with the co-existence of heavy metal ions for foam fractionation

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Journal of Environmental Sciences 2012年第12期24卷 2068-2074页

作者： Dongmei Zhang guangming zeng Jinhui Huang Wenkai Bi Gengxin Xie College of Environmental Science and Engineering Hunan UniversityChangsha 410082China Key Laboratory of Environmental Biology and Pollution Control Hunan UniversityMinistry of EducationChangsha 410082China

The interaction between a cationic dye Methylene Blue （MB） and an anionic surfactant sodium dodecyl sulfate （SDS） with the presence of Cd2＋ was investigated spectrophotometrically in a certain concentration range. The spectrophotometric measurements of dye-metal ion-surfactant system were carried out. The results indicated that the SDS concentration had a significant influence on the dye spectrum, while the addition of Cd2~ hardly caused change of the maximum value of absorbance. According to this observation, we concluded that electrostatic and hydrophobic interaction between dye and surfactant occurred up to a certain level, and the homo-ions Cd2＋ almost exerted no effect on the dye-surfactant complexation, establishing a theoretical foundation for simultaneous removal of organic dye and heavy metal using foam fractionation. Meanwhile, the effects of their interaction on foam performance were investigated. The results showed that the addition of Cd2＋ favored the tendency to ameliorate foam properties just contrary to MB. The feasibility of foam separation for dye and heavy metal removal from simulated wastewater was also confirmed using a continuous foam fractionator. In the simultaneous removal process, with the initial SDS concentration ranging from 0.5 to 5.0 retool/L, the maximum removal efticiencies of MB and Cd2＋ were obtained as 99.69% and 99.61%, respectively. The enrichment ratios were reduced from 24.34 to 7.65 for MB and from 22.01 to 3.35 for Cd2＋.

关键词： foam fractionation simultaneous removal spectroscopic study SDS MB Cd2＋

Biosorption of zinc(Ⅱ) from aqueous solution by dried activated sludge

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Journal of Environmental Sciences 2010年第5期22卷 675-680页

作者： Chunping Yang Jiaqiang Wang Min Lei Gengxin Xie guangming zeng Shenglian Luo College of Environmental Science and Engineering Hunan University Changsha 410082 China School of Environmental and Chemical Engineering Nanchang Hangkong University Nanchang 330063 China Key Laboratory of Environmental Biology and Pollution Control （Hunan University） Ministry of Education Changsha 410082 China

The biosorption potential of dried activated sludge as a biosorbent for zinc（Ⅱ） removal from aqueous solution was investigated.The effects of initial pH,contact time,initial zinc ion concentration,and adsorbent dosage on the biosorption processes were determined,and the equilibrium data were modeled by the Langmuir and Freundlich isotherms.The Langmuir isotherm model （R 2=0.999） was proved to fit the equilibrium data much better than the Freundlich isotherm model （R 2=0.918）.The monolayer adsorption capacity of dried activated sludge for zinc（Ⅱ） was found to be 17.86 mg/g at pH of 5 and 25°C.The kinetic data were tested using pseudo firstand second-order models.The results suggested that the pseudo second-order model （R 2 〉 0.999） was better for the description of the adsorption behavior of zinc（Ⅱ） onto the dried activated sludge.Fourier transform infrared spectral analysis showed that the dominant mechanism of zinc（Ⅱ） biosorption onto the dried activated sludge was the binding between amide groups and zinc ions.

关键词： activated sludge biosorption isotherms kinetics zinc（II）

Performance of biotrickling filters packed with structured or cubic polyurethane sponges for VOC removal

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Journal of Environmental Sciences 2011年第8期23卷 1325-1333页

作者： Chunping Yang Guanlong Yu guangming zeng Haining Yang Fayuan Chen Congying Jin College of Environmental Science and Engineering Hunan University Hunan 410082 China. College of Environmental Science and Engneering Zhejiang Gongshang University Hangzhou 310012 China Key Laboratory of Environmental Biology and Pollution Control Hunan University Ministry of Education Hunan 410082 China

Two identical bench-scale biotrickling filters （BTFs）, BTF 1 and BTF 2, were evaluated for toluene removal at various gas empty bed contact times （EBCTs） and organic loadings. BTF 1 and BTF 2 were packed with structured and cubic synthetic polyurethane sponges, respectively. At a constant toluene loading of 16 g/（m3.hr）, toluene removal efficiencies decreased from 98.8% to 64.3% for BTF 1 and from 98.4% to 74.1% for BTF 2 as gas EBCT decreased from 30 to 5 sec. When the toluene loading increased from 35 to 140 g/（m3.hr） at a gas EBCT of 30 sec, the removal efficiencies decreased from 99.1% to 77.4% for BTF 1 and from 99.0% to 81.5% for BTF 2. The pressure drop for both BTFs increased with increased air flow rate, and did not significantly vary while the toluene loading was increased under similar operation conditions. BTF 1 and BTF 2 could start up successfully within 19 and 27 days, respectively, when packed with fresh sponge media, and the performances could be restored in 3-7 days after biomass was removed and wasted from the media. BTF 2 displayed higher removal efficiency even under shorter EBCT or higher loading rate than BTF1 when other operation conditions were similar, while it showed lower pressure drop than BTF 1 during the whole period of operation. These results demonstrated that both BTFs could treat waste gas containing toluene effectively.

关键词： biofiltration biotrickling filter elimination capacity empty bed contact time sponge volatile organic compound

Roles of acid-producing bacteria in anaerobic digestion of waste activated sludge

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Frontiers of Environmental Science & Engineering 2018年第6期12卷 27-37页

作者： Sijia Ai Hongyu Liu Mengjie Wu guangming zeng Chunping Yang College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University)Ministry of EducationChangsha 410082China Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling College of Environmental Science and EngineeringZhejiang Gongshang UniversityHangzhou 310018China

Three acid-producing strains were isolated and identified. The isolated bacteria accelerated the anaerobic digestion processes. Bacillus coagulans improved TCOD removal, VS removal and biogas production. The optimal i... 详细信息

关键词： Anaerobic digestion Waste activated sludge Acid-producing bacteria Bacillus coagulans

Biodegradation of 3,5-dimethyl-2,4-dichlorophenol in saline wastewater by newly isolated Penicillium sp.yz11-22N2

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Journal of Environmental Sciences 2017年第7期29卷 211-220页

作者： Zhou Yan Huijun He Chunping Yang guangming zeng Le Luo Panpan Jiao Huiru Li Li Lu College of Environmental Science and Engineering Hunan UniversityChangsha 410082China Key Laboratory of Environmental Biology and Pollution Control Hunan UniversityMinistry of EducationChangsha 410082China Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling College of Environmental Science and EngineeringZhejiang Gonqshang UniversityHangzhouZhejiang 310018China

In this study,the performance of 3,5-dimethyl-2,4-dichlorophenol（DCMX） degradation by a screened strain was investigated.18 S r DNA and the neighbor-joining method were used for identification of the isolated strain.The results of phylogenetic analysis and scanning electron micrographs showed that the most probable identity of the screened strain should be Penicillium sp.Growth characteristics of Penicillium sp.and degradation processes of DCMX were examined.Fourier transform infrared spectroscopy of the inoculated DCMX solution was recorded,which supported the capacity of DCMX degradation by the screened Penicillium sp.Under different salinity conditions,the highest growth rate and removal efficiency for DCMX were obtained at p H 6.0.The removal efficiency decreased from 100%to 66% when the DCMX concentration increased from 5 to 60 mg/L,respectively.Using a Box–Behnken design,the maximum DCMX removal efficiency was determined to be 98.4%.With acclimation to salinity,higher removal efficiency could be achieved.The results demonstrate that the screened Penicillium sp.has the capability for degradation of DCMX.

关键词： Saline wastewater 3,5-Dimethyl-2,4-dichlorophenol Penicillium sp. Laccase

Characterization and performance of V2Os/CeO2 for NH3-SCR of NO at low temperatures

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Frontiers of Environmental Science & Engineering 2012年第2期6卷 156-161页

作者： Caiting LI Qun LI Pei LU Huafei CUI guangming zeng Key Laboratory of Environmental Biology and Pollution Control(Ministry of Education) College of Environmental Science and EngineeringHunan UniversityChangsha 410082China

A series of CeO supported V O catalysts with various loadings were prepared with different calcination temperatures by the incipient impregnation. The catalysts were evaluated for low temperature selective catalytic reduction (SCR) of NO with ammonia (NH ). The effects of O and SO on catalytic activity were also studied. The catalysts were characterized by specific surface areas (S ) and X–ray diffraction (XRD) methods. The experimental results showed that NO conversion changed significantly with the different V O loading and calcination temperature. With the V O loading increasing from 0 to 10 wt%, NO conversion increased significantly, but decreased at higher loading. The optimum calcination temperature was 400°C. The best catalyst yielded above 80% NO conversion in the reaction temperature range of 160°C–300°C. The formation of CeVO on the surface of catalysts caused the decrease of redox ability.

关键词： VeOs/CeO2 catalysts NH3-SCR （selectivecatalytic reduction） the incipient impregnation lowtemperatures

Enhanced removal of ethylbenzene from gas streams in biotrickling filters by Tween-20 and Zn(Ⅱ)

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Journal of Environmental Sciences 2014年第12期26卷 2500-2507页

作者： Lu Wang Chunping Yang Yan Cheng Jian Huang Haining Yang guangming zeng Li Lu Shanying He Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling College of Environmental Science and Engineering Zhejiang Gongshang University College of Environmental Science and Engineering Hunan University Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education

The effects of Tween-20 and Zn（II） on ethylbenzene removal were evaluated using two biotrickling filters（BTFs）, BTF1 and BTF2. Only BTF1 was fed with Tween-20 and Zn（II）.Results show that ethylbenzene removal decreased from 94% to 69% for BTF1 and from 74%to 54% for BTF2 with increased organic loading from 64.8 to 189.0 g ethylbenzene/（m3·hr） at EBRT of 40 sec. The effect of EBRT（60–15 sec） at a constant ethylbenzene inlet concentration was more significant than that of EBRT（30–10 sec） at a constant organic loading. Biomass accumulation rate within packing media was reduced significantly.

关键词： Biofilm Biotrickling filter Ethylbenzene Surfactant Zinc

A restoration-promoting integrated floating bed and its experimental performance in eutrophication remediation

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Journal of Environmental Sciences 2014年第5期26卷 1090-1098页

作者： Yiming Guo Yunguo Liu guangming zeng Xinjiang Hu Xin Li Dawei Huang Yunqin Liu Yicheng Yin College of Environmental Science and Engineering Hunan University Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education

Numerous studies on eutrophication remediation have mainly focused on purifying water first, then restoring submerged macrophytes. A restoration-promoting integrated floating bed （RPIFB） was designed to combine the processes of water purification and macrophyte restoration simultaneously. Two outdoor experiments were conducted to evaluate the ecological functions of the RP1FB. Trial 1 was conducted to compare the eutrophication purification among floating bed, gradual-submerging bed （GSB） and RPIFB technologies. The results illustrated that RPIFB has the best purification capacity. Removal efficiencies of RPIFB for TN, TP,NH4＋-N, NO3-N, CODcr, Chlorophyll-a and turbidity were 74.45%, 98.31%, 74.71%, 88.81%, 71.42%, 90.17% and 85%, respectively. In trial 2, influences of depth of GSB and photic area in RPIFB on biota were investigated. When the depth of GSB decreased and the photic area of RPIFB grew, the height of Potamogeton crispus Linn. increased, but the biomass of Canna indica Linn. was reduced. The mortalities of Misgurnus anguillicaudatus and Bellamya aeruginosa in each group were all less than 7%. All results indicated that when the RPIFB was embedded into the eutrophic water, the regime shift from phytoplankton-dominated to macrophyte-dominated state could be promoted. Thus, the RPIFB is a promising remediation technology for eutrophication and submerged macrophyte restoration.

关键词： submerged macrophyte restoration eutrophication floating bed regime shift

Enhanced efficiency of cadmium removal by Boehmeria nivea(L.) Gaud. in the presence of exogenous citric and oxalic acids

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Journal of Environmental Sciences 2014年第12期26卷 2508-2516页

作者： Huaying Li Yunguo Liu guangming zeng Lu Zhou Xin Wang Yaqin Wang Chunlin Wang Xinjiang Hu Weihua Xu College of Environmental Science and Engineering Hunan University Key Laboratory of Environmental Biology and Pollution Control Hunan University Ministry of Education College of Resources and Environmental Science Hunan Normal University

Boehmeria nivea（L.） Gaud. is a potential candidate for the remediation of Cd contaminated sites. The present investigation aims to explore Cd tolerance threshold and to quickly identify the role of exogenous organic acids in Cd uptake and abiotic metal stress damage.Elevated Cd levels（0–10 mg/L） resulted in an obvious rise in Cd accumulation, ranging from268.0 to 374.4 in root and 25.2 to 41.2 mg/kg dry weight in shoot, respectively. Citric acid at1.5 mmol/L significantly facilitated Cd uptake by 26.7% in root and by 1-fold in shoot,respectively. Cd translocation efficiency from root to shoot was improved by a maximum of66.4% under 3 mmol/L of oxalic acid. Citric acid exhibited more prominent mitigating effect than oxalic acid due to its stronger ligand affinity for chelating with metal and avoiding the toxicity injury of free Cd ions more efficiently. The present work provides a potential strategy for efficient Cd remediation with B. nivea.

关键词： Heavy metal Phytoremediation Lipid peroxidation Antioxidant defense Translocation factor